Hi Thorsten,
On 2010-04-14 04:31, Thorsten Godau wrote:
> Hi Stuart,
>
> i am playing around with my TinyCAN-I in SLCAN mode and SocketCAN,
> but can not get this thing working with SocketCAN.
> The CAN interface works well when i use a dumb terminal to send and
> receive some frames.
>
> Can you give me some quick hints how to setup the interface corectly?
>
> What i do is (and it is based on an old description of Huber Hoegl, who
> did some experiments with TinyCAN-I and SocketCAN in 2008):
>
> - load the kernelmodules can, can_raw, can-dev and slcan on boot
> (i checked this with lsmod, all modules loaded)
> - set up the ttyUSB0 baudrate with "stty -F /dev/ttyUSB0 57600"
> - Attach the interface with "slcan_attach -o -s8 -c /dev/ttyUSB0"
> - Start the daemon with "slcand ttyUSB0"
> - Setup network interface with "ifconfig slc0 up"
We have the el-cheapo Lawicel AB CANUSB devices... which I note don't
always function first-go under Windows. In Linux; with the patch
applied to the SocketCAN tree... if I manually have to set it up...
# slcand ttyUSB0 S8 O -- C
CANUSB device starts working at this point and a slc0 device is created.
To bring the interface up in Linux:
# ifconfig slc0 up
Host platform here is Gentoo Linux/MIPS on a Lemote Yeeloong. I haven't
tried the patch on i386 yet. With the patch applied, it is possible for
udev to handle CANUSB. This is my /etc/udev/rules.d/99-canusb.rules file:
SUBSYSTEM!="tty", GOTO="canusb_rules_end"
SYSFS{idVendor}=="0403", SYSFS{idProduct}=="ffa8", SUBSYSTEM=="tty",
KERNEL=="ttyUSB[0-9]*", RUN+="/etc/hotplug/usb/canusb.hotplug"
LABEL="canusb_rules_end"
Then in /etc/hotplug/usb/canusb.hotplug:
#!/bin/sh
if [ "${ACTION}" = "add" ]; then
sleep 5
slcand $( basename ${DEVNAME} ) S8 O -- C
exit $?
elif [ "${ACTION}" = "remove" ]; then
kill -TERM $(< /var/run/slcand-$( basename ${DEVNAME} ).pid )
sleep 5
kill -KILL $(< /var/run/slcand-$( basename ${DEVNAME} ).pid )
exit $?
fi
With this arrangement, I can skip the slcand step when bringing the
interface up. I can't easily do the `ifconfig slc0 up` step however as
I don't know which slcX device the unit will appear, otherwise you could
add that after the slcand call. (Or you can assume only one device is
plugged in.)
The other interesting note, I can't seem to get slcand to terminate
gracefully... I have to kill it with a SIGKILL. This is before I
attempt unplugging the CANUSB device. Not sure what the procedure is
for cleanly shutting down the slcan device before unplugging it... as
merely bringing the slcX device down does not terminate slcand, and it
won't respond to SIGTERM.
Regards,
--
Stuart Longland (aka Redhatter, VK4MSL) .'''.
Gentoo Linux/MIPS Cobalt and Docs Developer '.'` :
. . . . . . . . . . . . . . . . . . . . . . .'.'
http://dev.gentoo.org/~redhatter :.'
I haven't lost my mind...
...it's backed up on a tape somewhere.
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